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A89503KLPTR-5 PDF预览

A89503KLPTR-5

更新时间: 2024-10-28 20:06:27
品牌 Logo 应用领域
急速微 - ALLEGRO /
页数 文件大小 规格书
45页 2739K
描述
Motion Control Electronic,

A89503KLPTR-5 技术参数

生命周期:ActiveReach Compliance Code:compliant
Base Number Matches:1

A89503KLPTR-5 数据手册

 浏览型号A89503KLPTR-5的Datasheet PDF文件第38页浏览型号A89503KLPTR-5的Datasheet PDF文件第39页浏览型号A89503KLPTR-5的Datasheet PDF文件第40页浏览型号A89503KLPTR-5的Datasheet PDF文件第42页浏览型号A89503KLPTR-5的Datasheet PDF文件第43页浏览型号A89503KLPTR-5的Datasheet PDF文件第44页 
A89503  
80 V Automotive Half-Bridge MOSFET Driver  
AV = 20 (SAG[2:0] = 0b010)  
Current Sense Amplifier Configuration  
• VOOS = 1 V (SAO[3:0] = 0b1001)  
Amplifier gain, AV, and output offset zero point voltage, VOOS  
,
may be set to a range of values by the SAG[2:0] and SAO[3:0]  
variables respectively as defined in the Current Sense Ampli-  
fiers section above. It is important that both values are selected  
to ensure the absolute voltage at the CSO output, VCSO, remains  
within the amplifier’s dynamic range, VCSOUT, and the dynamic  
range of any downstream signal processing circuitry. Allowance  
must be made for both positive and negative current flows within  
the sense resistor.  
VID ranges between –20 mV and +40 mV and VCSO between  
0.6 V and 1.8 V. VCSO remains within the amplifier dynamic  
range, VCSOUT, of 0.3 V to 4.8 V. However, if AV is increased  
to 50, VCSO attempts to drive to 0 V and 3.0 V, the amplifier  
dynamic range limits are not complied with, and the amplifier  
output saturates at its negative limit. This situation could be rem-  
edied by reducing AV to 30 (0.4 V < VCSO < 2.2 V) or increasing  
VOOS to 1.5 V (0.5 V < VCSO < 3.5 V).  
With reference to Figure 3, the relationship between phase cur-  
rent IPH, sense resistor value, RS, and differential amplifier input  
voltage, VID is given by:  
Current Sense Amplifier Output Signals  
As defined in Figure 3, the current sense amplifier output signals  
on the CSO pin is internally referenced to the output offset which  
can be made available on the CSO terminal by setting the SAT bit  
to 1. The sense amp output voltage and the output offset voltage  
may be measured consecutively with respect to ground, and the  
values subtracted to give the required output signal voltages as  
VID = VCSP – VCSM = IPH × RS  
The current sense amplifier’s output voltage on CSO with respect  
to the programmed value of output offset is:  
VCSD = (VCSP – VCSM) × AV  
VCSD = VCSO – VOOS  
.
The absolute voltage on CSO when SAT = 1 with respect to  
ground is therefore:  
The Input Offset Voltage, VIOS, and the associated drift, ΔVIOS  
,
VCSO = [(VCSP – VCSM) × AV] + VOOS  
multiplied by the selected amplifier gain, AV, represent the offset  
and offset drift limits that apply to VCSD. The Output Offset Error  
limits, EVO, and Output Offset Drift limits, VOOSD, apply directly  
to VOOS. EVO and VOOSD do not affect current sense output  
accuracy.  
If, for example, the following parameter values are assumed:  
• RS = 1 mΩ  
• IPH = –20A to +40A  
41  
Allegro MicroSystems  
955 Perimeter Road  
Manchester, NH 03103-3353 U.S.A.  
www.allegromicro.com  

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